Low-delay-pulse, low-crosstalk and high-collection-efficiency micro-channel plate

Abstract

The invention relates to low-delay-pulse, low-crosstalk and high-collection-efficiency micro-channel plate. The micro-channel plate comprises a two-dimensional array composed of a plurality of parallel channels. An input electrode layer is plated on the upper end surface of the two-dimensional array. An output electrode layer is plated on the lower end surface of the two-dimensional array. The improvement of the invention is embodied as an input port arranged in the input electrode layer and an output port arranged in the output electrode layer. The input port is communicated with the upper ends of the channels, and the output port is communicated with the lower ends of the channels. The input port is gradually reduced from top to bottom, so that the opening area of the channels of the micro-channel plate is larger than 90%. The surface of the input electrode is covered with a thin film with a high secondary electron emission coefficient. According to the micro-channel plate, the opening area of micro-channels is large, so that the probability of electrons entering the channels is increased. The collecting efficiency is improved. The thin film made of the high-secondary electron emission material and covered on the surface of the electrode can reduce the probability of electron loss falling on the surface of the electrode. As a result, the collecting efficiency is further improved.

Description

technical field [0001] The invention belongs to the field of weak photoelectric detection, and in particular relates to a microchannel plate with low delay pulse, low crosstalk and high collection efficiency. Background technique [0002] A microchannel plate is a device capable of multiplying electrons continuously. A microchannel plate is composed of millions of glass capillary channels arranged at a certain inclination angle. The inner wall of each channel has good electrical conductivity and secondary electron emission performance. The two ends of the channel are plated with input and output electrodes. When a voltage is applied between the two electrodes, a uniform electric field is established in the axial direction of the channel, and the electrons entering the channel continuously hit the inner wall of the channel under the action of the electric field, generating secondary electrons and realizing continuous multiplication. Because of high gain, fast response, and e...

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Problems solved by technology

However, the electrons generated on the electrode surface still need to bounce back into the channel (such as figure 1 As shown, due to the small opening area of ​​the channel, the probability of electrons bouncing on the electrode surface is high and the probability of electrons entering other channels during the rebounding process is also high), which will also cause crosstalk and delayed pulses, and due to the The secondary electrons bouncing off the electrode surface are more than ordinary microchannel plates, resulting in larger crosstalk and delayed pulses of this microchannel plate than ordinary microchannel plates

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